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Message-ID: <7f563b21-4c06-134e-f30d-02ed61521c1f@broadcom.com>
Date:   Wed, 10 May 2023 14:12:08 +0200
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To:     Hans de Goede <hdegoede@redhat.com>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>
Cc:     linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com,
        SHA-cyfmac-dev-list@infineon.com, regressions@lists.linux.dev,
        Felix <nimrod4garoa@gmail.com>, stable@vger.kernel.org
References: <20230510100050.27099-1-hdegoede@redhat.com>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
Subject: Re: [PATCH] wifi: brcmfmac: Check for probe() id argument being NULL
In-Reply-To: <20230510100050.27099-1-hdegoede@redhat.com>
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On 5/10/2023 12:00 PM, Hans de Goede wrote:
> The probe() id argument may be NULL in 2 scenarios:
> 
> 1. brcmf_pcie_pm_leave_D3() calling brcmf_pcie_probe() to reprobe
>     the device.
> 
> 2. If a user tries to manually bind the driver from sysfs then the sdio /
>     pcie / usb probe() function gets called with NULL as id argument.
> 
> 1. Is being hit by users causing the following oops on resume and causing
> wifi to stop working:
> 
> BUG: kernel NULL pointer dereference, address: 0000000000000018
> <snip>
> Hardware name: Dell Inc. XPS 13 9350/0PWNCR, BIDS 1.13.0 02/10/2020
> Workgueue: events_unbound async_run_entry_fn
> RIP: 0010:brcmf_pcie_probe+Ox16b/0x7a0 [brcmfmac]
> <snip>
> Call Trace:
>   <TASK>
>   brcmf_pcie_pm_leave_D3+0xc5/8x1a0 [brcmfmac be3b4cefca451e190fa35be8f00db1bbec293887]
>   ? pci_pm_resume+0x5b/0xf0
>   ? pci_legacy_resume+0x80/0x80
>   dpm_run_callback+0x47/0x150
>   device_resume+0xa2/0x1f0
>   async_resume+0x1d/0x30
> <snip>
> 
> Fix this by checking for id being NULL.
> 
> In the case of brcmf_pcie_probe() also add a manual lookup of the id
> when it is NULL so that fwvid will still get set correctly on reprobe
> on resume.

Hi Hans,

Thanks for looking into this and coming up with a fix. Does it make 
sense to proceed with BRCMF_FWVENDOR_INVALID though. I think it will end 
up in probe failure in brcmf_fwvid_attach() because of it so why not 
bail out right away.

Regards,
Arend

> Fixes: da6d9c8ecd00 ("wifi: brcmfmac: add firmware vendor info in driver info")
> Reported-by: Felix <nimrod4garoa@gmail.com>
> Link: https://lore.kernel.org/regressions/4ef3f252ff530cbfa336f5a0d80710020fc5cb1e.camel@gmail.com/
> Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
> Cc: stable@vger.kernel.org
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 2 +-
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c   | 8 +++++++-
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c    | 2 +-
>   3 files changed, 9 insertions(+), 3 deletions(-)

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